Analysis of current distribution among long-flashover arresters for 10 kV overhead line protection against direct lightning strikes

The paper presents ATP-EMTP software simulation of a direct lightning strike (DLS) into the one phase conductor of 10 kV overhead line (OHL). The model takes into account the influence of induced overvoltages (IOV) from the lightning leader. There have been obtained distributions of surge current among modular long-flashover arresters (LFA-M) mounted on the poles depending on the lightning strike location and pole footing resistance. The three principal types of impulses flowing through the arresters of each phase have been revealed. It has been discovered that a current impulse shape at arresters can greatly differ from that of lightning.